Quantum couplings and magnetic properties of CoCrxFe2-xO4 (0<x<1) spinel ferrite nanoparticles synthesized with reverse micelle method

被引：68
作者：
Han, M [1 ]
Vestal, CR [1 ]
Zhang, ZJ [1 ]
机构：
[1] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 02期
关键词：
D O I：
10.1021/jp035966m
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Spinel ferrite CoCrxFe2-xO4 nanoparticles over a compositional range 0 < x < I were synthesized using a reverse micelle microemulsion method. This method provided excellent control over the composition and gave a reasonable size distribution. Upon increased Cr substitution, the blocking temperature, saturation magnetization, remnant magnetization, and coercivity were all found to decrease. The compositional influence upon the magnetic properties is consistent with the effects on the magnetocrystalline anisotropy energy by weakened coupling between electron spin and the angular momentum of electron orbital (L-S coupling). The results from size dependent magnetic studies on the nanoparticles with a composition of CoCr0.5Fe1.5O4 were found to agree well with the Stoner-Wohlfarth model.
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页码：583 / 587
页数：5
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